Why some hammerhead sharks seem to 'hold their breath' during dives

How is it that the hammerhead shark has evolved in a significantly different manner than other sharks yet they have survived? - Quora

Larger spleens may help 'sea nomads' stay underwater longer

What are the natural predators of hammerhead sharks? - Quora

Larger spleens may help 'sea nomads' stay underwater longer

Hammerhead Sharks Can 'Hold Their Breath,' A First for Fish, Smart News

Rete Mirabile - World of Warmth

Hammerheads take a deep breath to hunt in deep waters

Hammerhead sharks hold breath to keep warm on deep dives

Hammerhead sharks 'hold their breath' in deeper, colder waters, research shows : NPR